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Another high performing area was the three sciences - biology, chemistry and physics - in which 52% achieved level 9, compared to 50% in 2018.

Ms Carlin, who will leave in January 2020, said: "I am delighted with these excellent GCSE results, especially as they are the new, more challenging reformed GCSEs.

"This can be attributed to the dedication and hard work from the year-11 pupils and the academic and pastoral support from the teaching staff who push the students to reach their potential."

Ipswich High School. Picture: GREGG BROWN

Speaking about her departure, Ms Carlin said: "Since starting at Ipswich High School in 2013, I have been incredibly proud of the countless achievements of pupils and staff.

"Our school is a unique and special community and in my 25 years of teaching, I have never worked anywhere where the pupils are so inspiring and happy.

"I know that the school will be in the safe hands of the highly experienced senior leadership team during any transition and that there will be a great deal of interest in the headship as the directors look to appoint my replacement.

"The school is thriving and is at such an exciting point in its history."